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A scenario is a set of related concepts pertinent to the origin of life (abiogenesis), such as the iron-sulfur world. Many alternative abiogenesis scenarios have been proposed by scientists in a variety of fields from the 1950s onwards in an attempt to explain how the complex mechanisms of life could have come into existence. These include ...
GADV-protein world is a hypothetical stage of abiogenesis. GADV stands for the one letter codes of four amino acids , namely, glycine (G), alanine (A), aspartic acid (D) and valine (V), the main components of GADV proteins .
A wheeled buffalo figurine—probably a children's toy—from Magna Graecia in archaic Greece [1]. Several organisms are capable of rolling locomotion. However, true wheels and propellers—despite their utility in human vehicles—do not play a significant role in the movement of living things (with the exception of the corkscrew-like flagella of many prokaryotes).
A total of 6.1 million prokaryotic genes from Bacteria and Archaea were sequenced, identifying 355 protein clusters from among 286,514 protein clusters that were probably common to the LUCA. The results suggest that the LUCA was anaerobic with a Wood–Ljungdahl (reductive Acetyl-CoA) pathway, nitrogen- and carbon-fixing, thermophilic.
The junkyard tornado argument uses a calculation of the probability of abiogenesis based on false assumptions, as comparable to "a tornado sweeping through a junk-yard might assemble a Boeing 747 from the materials therein" and to compare the chance of obtaining even a single functioning protein by chance combination of amino acids to a solar ...
Ball and chain inactivation can only happen if the channel is open. In neuroscience, ball and chain inactivation is a model to explain the fast inactivation mechanism of voltage-gated ion channels. The process is also called hinged-lid inactivation or N-type inactivation. A voltage-gated ion channel can be in three states: open, closed, or ...
Proteinoids, or thermal proteins, are protein-like, often cross-linked molecules formed abiotically from amino acids. [1] Sidney W. Fox initially proposed that they may have been precursors to the first living cells ( protocells ). [ 1 ]
Rolling circle replication produces multiple copies of a single circular template. Rolling circle replication ( RCR ) is a process of unidirectional nucleic acid replication that can rapidly synthesize multiple copies of circular molecules of DNA or RNA , such as plasmids , the genomes of bacteriophages , and the circular RNA genome of viroids .